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Google (Well, DuckDuckGo, but w/e) search reveals that one of the best ways to deal with onions short of goggles is to douse as you cut or cut under running water if you can manage. Water absorbs the sulfur compounds that make up the onion's defense mechanism, and helps with making you not cry like a little bitch.
The culinary program my gf goes to suggests chewing gum while you cut, but that doesn't seem to work for everyone.
tl;dr chewing gum might possibly work, but short of springing for goggles, try not to cut yourself while you chop under the tap.
